package com.ly.common.servlet;

import com.google.gson.Gson;
import com.ly.common.bean.Result;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 *  	封装的Servlet
 *  	/login.s   1个地址对应一个servlet
 *  	/BaseServlet/*  N个地址对应一个servlet
 *  	/BaseServlet/abc, /BaseServlet/eft  /BaseServlet
 */
// 抽象类
public abstract class BaseServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected Gson gson = new Gson();

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// 获取地址中的方法名
		String path = request.getRequestURL().toString();
		path = path.replaceAll(".+?/(\\w*)(\\.\\w+)?$", "$1");// 贪婪模式

		try {
			//执行公共代码
			request.setCharacterEncoding("utf-8");
			response.setCharacterEncoding("utf-8");
			response.setContentType("text/html;charset=utf-8");
			// 通过反射查找对应方法, this.getClass() 获取当前对象的类对象
			Method m = this.getClass().getDeclaredMethod(path, HttpServletRequest.class, HttpServletResponse.class);
			// 执行方法
			System.out.println("执行：" + m);
			try {
				m.setAccessible(false);
				Object ret = m.invoke(this, request, response);
				if (ret != null) {
					response.getWriter().append(gson.toJson(ret));
				}
			} catch (InvocationTargetException e) {
				e.printStackTrace();
				response.getWriter().append(gson.toJson(Result.failure("系统异常, 请联系管理员", null)));
			}
		} catch (NoSuchMethodException | SecurityException | IllegalAccessException | IllegalArgumentException e) {
			throw new RuntimeException("方法名错误：" + path, e);
		}

	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}

}
